Rurouni Kenshin: Meiji Kenkaku Romantan Saisen
Select the eight option at the main menu, "Settings", then select the bottom right section, "Password". Enter one of the following passwords to activate the corresponding cheat function.
Play as Himura Battousai
Enter hitokiri as a password.
Play as Shinsengumi Saito Hajime
Enter miburo as a password.